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        <h2 id="事件修饰符"><a href="#事件修饰符" class="headerlink" title="事件修饰符"></a>事件修饰符</h2><p>当一个点击事件嵌套在多个标签中时，它会以冒泡方式出发各标签的点击函数。<br>.stop用来阻止冒泡的发生<br>1.HTML结构<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">div</span> @<span class="attr">click</span>=<span class="string">'method1'</span> <span class="attr">id</span>=<span class="string">'app'</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">input</span> <span class="attr">value</span>=<span class="string">'test'</span> <span class="attr">type</span>=<span class="string">'button'</span> @<span class="attr">click</span>=<span class="string">'method2'</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">(以上代码,若点击button会出发两个点击函数)</span><br><span class="line">(以下代码,则不会)</span><br><span class="line"><span class="tag">&lt;<span class="name">div</span> @<span class="attr">click</span>=<span class="string">'method1'</span> <span class="attr">id</span>=<span class="string">'app'</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">input</span> <span class="attr">value</span>=<span class="string">'test'</span> <span class="attr">type</span>=<span class="string">'button'</span> @<span class="attr">click.stop</span>=<span class="string">'method2'</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>2.Vue实例<br><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> vm = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">    el: <span class="string">"app"</span>,</span><br><span class="line">    data: &#123;&#125;,</span><br><span class="line">    methods: &#123;</span><br><span class="line">        method1()</span><br><span class="line">        &#123;</span><br><span class="line">            alert(<span class="string">'点击了div'</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        method2()</span><br><span class="line">        &#123;</span><br><span class="line">            alert(<span class="string">'点击了button'</span>);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure></p>
<a id="more"></a>
<p>.prevent用来阻止默认发生事件,如地址跳转<br>1.HTML结构<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">'app'</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">"http://desperadoccy.club:521/"</span> @<span class="attr">click.prevent</span>=<span class="string">'test'</span>&gt;</span>秘密网址<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>2.Vue实例<br><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> vm = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">    el: <span class="string">"app"</span>,</span><br><span class="line">    data: &#123;&#125;,</span><br><span class="line">    methods: &#123;</span><br><span class="line">        test</span><br><span class="line">        &#123;</span><br><span class="line">            alert(<span class="string">'点击了链接,却没有跳转'</span>);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure></p>
<p>余下的几个事件修饰符就不一一举例了</p>
<ul>
<li>.stop       阻止冒泡</li>
<li>.prevent    阻止默认事件</li>
<li>.capture    添加事件侦听器时使用事件捕获模式</li>
<li>.self       只当事件在该元素本身（比如不是子元素）触发时触发回调</li>
<li>.once       事件只触发一次<h2 id="v-model"><a href="#v-model" class="headerlink" title="v-model"></a>v-model</h2>v-model用来实现双向绑定,即model和view的绑定<br>1.HTML结构<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">'app'</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">v-bind:value</span>=<span class="string">"msg"</span>&gt;</span> </span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
</ul>
<p>2.Vue实例<br><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> vm = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">    el: <span class="string">"app"</span>,</span><br><span class="line">    data: &#123;</span><br><span class="line">        msg: <span class="string">'v-bind可以实现v和m的数据同步'</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure></p>
<h2 id="在Vue中使用样式"><a href="#在Vue中使用样式" class="headerlink" title="在Vue中使用样式"></a>在Vue中使用样式</h2><h3 id="使用class样式"><a href="#使用class样式" class="headerlink" title="使用class样式"></a>使用class样式</h3><ol>
<li><p>数组</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;h1 :class=&quot;[&apos;red&apos;, &apos;thin&apos;]&quot;&gt;这是一个邪恶的H1&lt;/h1&gt;</span><br></pre></td></tr></table></figure>
</li>
<li><p>数组中使用三元表达式</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;h1 :class=&quot;[&apos;red&apos;, &apos;thin&apos;, isactive?&apos;active&apos;:&apos;&apos;]&quot;&gt;这是一个邪恶的H1&lt;/h1&gt;</span><br></pre></td></tr></table></figure>
</li>
<li><p>数组中嵌套对象</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;h1 :class=&quot;[&apos;red&apos;, &apos;thin&apos;, &#123;&apos;active&apos;: isactive&#125;]&quot;&gt;这是一个邪恶的H1&lt;/h1&gt;</span><br></pre></td></tr></table></figure>
</li>
<li><p>直接使用对象</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;h1 :class=&quot;&#123;red:true, italic:true, active:true, thin:true&#125;&quot;&gt;这是一个邪恶的H1&lt;/h1&gt;</span><br></pre></td></tr></table></figure>
</li>
</ol>
<h3 id="使用内联样式"><a href="#使用内联样式" class="headerlink" title="使用内联样式"></a>使用内联样式</h3><ol>
<li><p>直接在元素上通过 <code>:style</code> 的形式，书写样式对象</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;h1 :style=&quot;&#123;color: &apos;red&apos;, &apos;font-size&apos;: &apos;40px&apos;&#125;&quot;&gt;这是一个善良的H1&lt;/h1&gt;</span><br></pre></td></tr></table></figure>
</li>
<li><p>将样式对象，定义到 <code>data</code> 中，并直接引用到 <code>:style</code> 中</p>
<ul>
<li><p>在data上定义样式：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">data: &#123;</span><br><span class="line">        h1StyleObj: &#123; color: &apos;red&apos;, &apos;font-size&apos;: &apos;40px&apos;, &apos;font-weight&apos;: &apos;200&apos; &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>在元素中，通过属性绑定的形式，将样式对象应用到元素中：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;h1 :style=&quot;h1StyleObj&quot;&gt;这是一个善良的H1&lt;/h1&gt;</span><br></pre></td></tr></table></figure>
</li>
</ul>
</li>
<li><p>在 <code>:style</code> 中通过数组，引用多个 <code>data</code> 上的样式对象</p>
<ul>
<li><p>在data上定义样式：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">data: &#123;</span><br><span class="line">        h1StyleObj: &#123; color: &apos;red&apos;, &apos;font-size&apos;: &apos;40px&apos;, &apos;font-weight&apos;: &apos;200&apos; &#125;,</span><br><span class="line">        h1StyleObj2: &#123; fontStyle: &apos;italic&apos; &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>在元素中，通过属性绑定的形式，将样式对象应用到元素中：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;h1 :style=&quot;[h1StyleObj, h1StyleObj2]&quot;&gt;这是一个善良的H1&lt;/h1&gt;</span><br></pre></td></tr></table></figure>
</li>
</ul>
</li>
</ol>
<h2 id="Vue指令之v-for和key属性"><a href="#Vue指令之v-for和key属性" class="headerlink" title="Vue指令之v-for和key属性"></a>Vue指令之<code>v-for</code>和<code>key</code>属性</h2><ol>
<li>迭代数组</li>
</ol>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">&lt;ul&gt;</span><br><span class="line">  &lt;li v-for=&quot;(item, i) in list&quot;&gt;索引：&#123;&#123;i&#125;&#125; --- 姓名：&#123;&#123;item.name&#125;&#125; --- 年龄：&#123;&#123;item.age&#125;&#125;&lt;/li&gt;</span><br><span class="line">&lt;/ul&gt;</span><br></pre></td></tr></table></figure>
<ol start="2">
<li>迭代对象中的属性</li>
</ol>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">&lt;!-- 循环遍历对象身上的属性 --&gt;</span><br><span class="line"></span><br><span class="line">   &lt;div v-for=&quot;(val, key, i) in userInfo&quot;&gt;&#123;&#123;val&#125;&#125; --- &#123;&#123;key&#125;&#125; --- &#123;&#123;i&#125;&#125;&lt;/div&gt;</span><br></pre></td></tr></table></figure>
<ol start="3">
<li>迭代数字</li>
</ol>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">&lt;p v-for=&quot;i in 10&quot;&gt;这是第 &#123;&#123;i&#125;&#125; 个P标签&lt;/p&gt;</span><br></pre></td></tr></table></figure>
<blockquote>
<p>2.2.0+ 的版本里，<strong>当在组件中使用</strong> v-for 时，key 现在是必须的。</p>
</blockquote>
<p>当 Vue.js 用 v-for 正在更新已渲染过的元素列表时，它默认用 “<strong>就地复用</strong>” 策略。如果数据项的顺序被改变，Vue将<strong>不是移动 DOM 元素来匹配数据项的顺序</strong>， 而是<strong>简单复用此处每个元素</strong>，并且确保它在特定索引下显示已被渲染过的每个元素。</p>
<p>为了给 Vue 一个提示，<strong>以便它能跟踪每个节点的身份，从而重用和重新排序现有元素</strong>，你需要为每项提供一个唯一 key 属性。</p>
<h2 id="关于鸽子"><a href="#关于鸽子" class="headerlink" title="关于鸽子"></a>关于鸽子</h2><p>由于科创相关前端已经完成了，暂时用不到vue了，所以就咕咕咕了！我还会回来的！</p>
<h2 id="教学视频"><a href="#教学视频" class="headerlink" title="教学视频"></a>教学视频</h2><p>B站黑马视频: <a href="https://www.bilibili.com/video/av50680998" target="_blank" rel="noopener">https://www.bilibili.com/video/av50680998</a></p>

      
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